For everything, like lights, plugs, television, DSTV, WIFI, laptops, alarm, CCTV, fridge, washing machine, dishwasher, but exl things like tumble dryers. Continuous power generation during sunny hours feeding your house/office and battery. Battery can charge from the panels and grid.
 
3 × 5kw (15 kw) Deye Hybrid Inverters
24 × 450w solar panels
3 × 5.1 kw Lithium Battery
Installation included
COC
5 Year warranty on inverter, 10 year warranty on batteries, 25 year warranty on batteries
 
In perfect conditions, a 15kw inverter provides charging power of 14.4kw = 14400 max watts to the batteries with 24 (450w) panels. In the case of a power outage for example, if the load is drawing 1 kwh per hour, 3 x 5kw (15kw) batteries will last 15 hours.